Fission fragment angular distribution in heavy-ion-induced fission with anomalous behavior

Abstract

Fission fragment angular distribution in heavy-ion-induced fission reactions is of particular importance. Transition state theory is provided to determine the angular distribution of fission fragments which includes standard saddle-point statistical and standard scission-point statistical models. The standard saddle-point statistical model was not able to reproduce the experimental fission fragment angular anisotropies for several heavy-ion-induced fission systems. In contrast to the standard saddle-point model, the standard scission-point statistical model was fairly successful in the prediction of angular anisotropy in heavy-ion-induced fission reaction systems with an anomalous behavior in angular anisotropy of fission fragments, but this model is not widely used as the standard saddle-point statistical model. In this research, a generalized model is introduced for the prediction of fission fragments angular anisotropy in the heavy-ion-induced fission reaction systems having an anomalous behavior. For this purpose, we study the $^{14}\mathrm{N},^{16}\mathrm{O},^{19}\mathrm{F}+^{232}\mathrm{Th};^{16}\mathrm{O},^{19}\mathrm{F}+^{238}\mathrm{U};^{24}\mathrm{Mg},^{28}\mathrm{Si},^{32}\mathrm{S}+^{208}\mathrm{Pb};^{32}\mathrm{S}+^{197}\mathrm{Au}$; and $^{16}\mathrm{O}+^{248}\mathrm{Cm}$ reaction systems. Finally, it is shown that the presented model is much more successful than previous models.